Ok, you Aussies, I admit it, it's probably Aussie rules as a team sport and Ultimate fighting as a man to man sport. Those Irish sports hurling and gaelic football are pretty nuts too. Those for most aggressive. Most physically demanding: cycling-especially the big Euro stageraces-the Tour, the Giro, the Vuelta, no wonder those guys are on drugs; triathlon-the Ironman is no walk in the park; long-distance cross-country skiing, at least those guys are known for more or less insane training schedules.